package org.example.lotterysystem.common.utils;


import io.jsonwebtoken.Claims;
import io.jsonwebtoken.ExpiredJwtException;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;

import java.security.Key;
import java.util.Date;
import java.util.Map;

@Slf4j
public class JwtUtils {
    //过期时间：1小时的毫秒数
    private final static long EXPIRATION_DATE = 60*60*1000;
    private final static String secretString="H252y+hHitL/POvH6uWIrligOK6pd/Bk4n0eCfb2eWw=";//此处放getKey获得的key
    private final static Key key= Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretString));
    //生成令牌
    public static String getToken(Map<String,Object> claim) {
        return Jwts.builder()
                .setClaims(claim)
                .setExpiration(new Date(System.currentTimeMillis()+EXPIRATION_DATE))
                .signWith(key)
                .compact();
    }
    //解析令牌
    public static Claims parseToken(String token) {
        JwtParser build=Jwts.parserBuilder().setSigningKey(key).build();
        Claims body = null;
        try {
            body = build.parseClaimsJws(token).getBody();
        }catch (ExpiredJwtException e){
            log.error("token过期,校验失败,tokn:",token);
        } catch (Exception e) {
            log.error("token校验失败,token:",token);
        }
        return body;
    }
    //校验
    public static boolean checkToken(String token) {
        Claims body = parseToken(token);
        if(body==null){
            return false;
        }
        return true;
    }
    //获取id
    public static Integer getUserIdFromToken(String token) {
        Claims body = parseToken(token);
        if(body!=null){
            return (Integer) body.get("userId");
        }
        return null;
    }
}
